Add racc dependency to fix parser loading issues

[jonatas]

This PR adds the racc gem as a dependency to fix the LoadError issue when loading the parser.\n\nThe error 'cannot load such file -- racc/parser' was preventing the test suite from running. Adding racc as an explicit dependency resolves this issue.\n\nAll tests are now passing:\n- 196 examples\n- 0 failures\n- 95.57% test coverage